CN105688585A - Integrated smoke dedusting and demercurating device and treatment method thereof for composite filmed filter bag of plasma reactor - Google Patents
Integrated smoke dedusting and demercurating device and treatment method thereof for composite filmed filter bag of plasma reactor Download PDFInfo
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- CN105688585A CN105688585A CN201610227428.9A CN201610227428A CN105688585A CN 105688585 A CN105688585 A CN 105688585A CN 201610227428 A CN201610227428 A CN 201610227428A CN 105688585 A CN105688585 A CN 105688585A
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
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- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
- B01D53/323—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00 by electrostatic effects or by high-voltage electric fields
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D2257/602—Mercury or mercury compounds
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Abstract
The invention provides an integrated smoke dedusting and demercurating device and a treatment method thereof for a composite filmed filter bag of a plasma reactor. The device comprises the plasma reactor and the filmed filter bag, which are of coaxial structure, and the filmed filter bag wraps the plasma reactor. The plasma is combined with the filmed filter bag, and dust in the smoke generates charges to coagulate by means of plasma. Meanwhile, oxygen-contained radical in the plasma can oxidize elemental mercury, and gas can be dedusted and elemental mercury can be removed by oxidation using demercurating catalyst in the filter bag at the same time when gas passes the filmed filter bag. In addition, oxygen radicals generated by plasma can activate the catalyst, and removal efficiency of fine particles and elemental mercury is leveled up.
Description
Technical field
The invention belongs to filed of flue gas purification, relate to a kind of flue gas ash removal mercury removal device and processing method thereof, particularly relate to integrated fume dedusting mercury removal device and the processing method thereof of a kind of plasma reactor associating membrane bag filter。
Background technology
Coal-burning power plant and petrochemical industry, can produce a large amount of dust, SO in its combustion processx、NOxOr the multiple pollutant such as heavy metal。In recent years, along with environment and human body are had, because it, the great attention endangering greatly and receiving domestic and international researcher by the enhancing day by day improved with people's environmental consciousness of environmental regulation, fine particulates and two kinds of pollutant of heavy metal。In order to strengthen environmental protection dynamics, improving environment, the emission standard of air pollutants for boilers regulation that on May 16th, 2014 is newly issued, the maximal emission standard of new construction of coal-fired boiler particulate matter is 50mg/m3, key area discharge standard is 30mg/m3, and the discharge standard of Elemental Mercury also drops to 0.05mg/m3。Fine particulates is primarily referred to as the solid particulate matter of equivalent aerodynamic diameter≤10 μm, and owing to particle diameter is less, specific surface area is greatly increased, and easily becomes carrier or the reactant of other poisonous and harmful substances (such as acidic oxide, toxic heavy metal etc.)。Environment and human health are had very big harm by fine particulates, there is research display, the reduction of atmospheric visibility is had important impact by fine particulates particularly PM2.5, compared with coarseparticulate, it is higher that blind ability drops in fine particle (PM2.5), is the main cause causing haze weather。In addition the granule less than 10um can enter pulmonary by nose, causes respiratory tract and pulmonary disease。
For the elimination of particulate matter in flue gas, the industrial kind having a cleaner unit is very many, such as industrial dedusting technology such as existing cyclone dust extractor and sack cleaners, the removal effect of fine particulates is poor, and electrostatic precipitator and hydrofilter are difficult to the dust particale of trapping 0.1～1 μm。So for the elimination of industrial fine particulates, research worker proposes various new high-effective dust-removing technology, as promote and improve low pressure drop high efficiency electrostatic dedusting, wet static dedusting technology, electricity novel elimination particulate the thing such as bag composite dedusting technology and plasma method method, to improve the removal efficiency of fine particulates。
Hydrargyrum in flue gas generally has three kinds of forms: particulate Hg, mercury oxide and Elemental Mercury。Wherein particulate Hg and mercury oxide can remove in the devices such as follow-up desulfurization, also can be attached on particulate matter and be removed by dust arrester, but due to the high volatility of Elemental Mercury and low aqueous solubility so that it is it is difficult to be removed by said apparatus, and it is discharged in air with flue gas, cause environmental pollution。
CN101693465A discloses the integral denitration demercuration method of a kind of absorbing synergic plasma effect, it is in the gas containing nitric oxide and hydrargyrum, add nitrogen and mix, be passed to crest voltage be not less than 3000 volts, pulse power frequency be not less than the high-frequency and high-voltage electric field of 500 hertz, it is achieved denitration demercuration simultaneously。Although the method make use of the method for absorbing synergic plasma, but it is poor to the removal effect of the fine particulates in pending gas, simultaneously that the removal effect of Elemental Mercury is also undesirable。
CN101716451A discloses a kind of discharge plasma and the method absorbing the elimination various pollutants in fume that combines。Fire coal or incineration flue gas after electric precipitation or bag-type dust process, are passed sequentially through prewashing column, one-level discharging plasma reactor, first grade absorption tower, two-stage discharge plasma reactor and two-level absorption tower by described method。Prewashing column is for flue gas preliminary clearning, cooling and the concentration of absorption liquid；One-level discharging plasma reactor is for NO oxidation and fine particle is charged, trapping elimination；First grade absorption tower is used for SO2、NOxWith the washing elimination of charged fine particle；Two-stage discharge plasma reactor removes for the oxidation of element Hg and the charged and trapping of acid mist, ammonium mist；Two-level absorption tower removes for the washing of oxidation state Hg with other pollutant。But the method is poor to the removal effect of fine particulates particularly PM2.5, and Elemental Mercury therein is difficult to be removed equally, and is discharged in air with flue gas。
Summary of the invention
For above-mentioned prior art, the particularly PM2.5 of fine particulates in flue gas and Elemental Mercury are difficult to problems such as being removed, the invention provides the integrated fume dedusting mercury removal device of a kind of plasma reactor associating membrane bag filter and processing method thereof。Plasma is combined by described method with membrane bag filter, the effect utilizing plasma makes the dust in flue gas produce charged and coalescence occurs, simultaneously the oxygen radical in plasma can oxidizing simple substance mercury, then gas is in membrane bag filter, micronic dust can be removed on the one hand, on the other hand the demercuration catalyst on filter bag can oxidation removal Elemental Mercury further, and the oxygen-derived free radicals of plasma generation can improve catalyst activity。
For reaching this purpose, the present invention by the following technical solutions:
First aspect, the invention provides a kind of flue gas ash removal mercury removal device, and described device includes plasma reactor and membrane bag filter, and described membrane bag filter and plasma reactor are coaxial configuration, and membrane bag filter is coated on the outer wall of plasma reactor。
The present invention adopts coaxial configuration that flue gas can be made to first pass through plasma reactor and makes the charged coalescence of fine particulates therein and carry out pre-dedusting, the Elemental Mercury of simultaneous oxidation part, then flue gas enters membrane bag filter through plasma reactor, at membrane bag filter, Elemental Mercury is further removed, to improve the removal efficiency of micronic dust and Elemental Mercury, and reduce plasma energy consumption；Further, the present invention is integral type structure, reduces the floor space of equipment, simple to operate, it is possible to effectively to save operating cost。
The size of plasma reactor of the present invention and membrane bag filter can be adjusted according to handled exhaust gas volumn。
As the preferred version of the present invention, described plasma reactor is tubular structure, and including electrode, air inlet and gas outlet, electrode is positioned at position, plasma reactor axis, and air inlet and gas outlet are opened on the barrel of plasma reactor。Wherein, electrode is high-field electrode, and its voltage is 0～100KV and does not include 0。
Preferably, the number of gas outlet is more than 2, for instance 2,4,6,8,10,13,15 or 17 and more than, its number can be adjusted according to actual production operating condition。
As the preferred version of the present invention, the electrode of described plasma reactor is connected with power supply, and the outer wall of plasma reactor is connected with earth lead。
Preferably, described power supply is high frequency electric source, and described high frequency electric source refers to the power supply of supply frequency scope more than 100KHz again, adopts high frequency electric source to have higher electric energy conversion efficiency and good charged intensity。
Preferably, described power supply be in power of alterating and direct current, the pulse power or radio-frequency power supply any one。
As the preferred version of the present invention, described membrane bag filter is coated on the outer wall of plasma reactor and is fixed on plasma reactor by filter bag support。
Preferably, membrane bag filter is coated on the outer wall of plasma reactor and is spaced apart 5～50cm with plasma reactor outer wall, such as 5cm, 10cm, 15cm, 20cm, 25cm, 30cm, 35cm, 40cm, 45cm or 50cm etc., it is not limited to cited numerical value, in listed scope, other numerical value are all feasible。
Preferred version as the present invention, membrane bag filter is by the combination of the polytetrafluoroethylene floor for polyimide fiber layer and supported catalyst, namely membrane bag filter is followed successively by the polytetrafluoroethylene floor of polyimide fiber layer and supported catalyst from inside to outside, or it is followed successively by polytetrafluoroethylene floor and the polyimide fiber layer of supported catalyst from inside to outside, but membrane bag filter of the present invention is not limited in the polytetrafluoroethylene floor of polyimide fiber layer and supported catalyst, other combine up to the filter pocket material of identical purpose and are equally applicable to the present invention, but it is optimum with the effect of polyimide fiber layer and the polytetrafluoroethylene floor of supported catalyst。
Preferably, the catalyst of described polytetrafluoroethylene floor load is demercuration catalyst。
Preferably, described demercuration catalyst is Mn-Ce/TiO2Catalyst, it is not limited to Mn-Ce/TiO2Catalyst, its spy can carry out the catalyst of demercuration catalysis and be equally applicable to the present invention, but with Mn-Ce/TiO2Catalyst effect is optimum。
Second aspect, the invention provides a kind of plasma binding film catalysis method to flue gas ash removal demercuration, described method is: after pending flue gas first plasma-treated removing dust granules thing and preliminary demercuration, carry out membrane bag filter dedusting further catalysis demercuration, finally give the flue gas after purification。
As the preferred version of the present invention, the voltage of described Cement Composite Treated by Plasma is 0～100KV and does not include 0, for instance 5KV, 10KV, 30KV, 50KV, 70KV or 100KV etc., it is not limited to cited numerical value, in listed scope, other numerical value are all feasible。
Preferably, described Cement Composite Treated by Plasma carries out in plasma reactor。
As the preferred version of the present invention, catalyst used in described membrane bag filter dedusting is demercuration catalyst。
Preferably, described demercuration catalyst is Mn-Ce/TiO2Catalyst。
Preferably, the temperature of described membrane bag filter dedusting is 150～300 DEG C, for instance 150 DEG C, 170 DEG C, 200 DEG C, 230 DEG C, 250 DEG C, 270 DEG C or 300 DEG C etc., it is not limited to cited numerical value, in listed scope, other numerical value are all feasible。
As the preferred version of the present invention, in the flue gas after purification, particle content is 5～20mg/m3, for instance 5mg/m3、7mg/m3、10mg/m3、13mg/m3、15mg/m3、17mg/m3Or 20mg/m3Deng, it is not limited to cited numerical value, in listed scope, other numerical value are all feasible；Mercury content is 0.4～1ug/m3, for instance 0.4ug/m3、0.5ug/m3、0.6ug/m3、0.7ug/m3、0.8ug/m3、0.9ug/m3Or 1ug/m3Deng, it is not limited to cited numerical value, in listed scope, other numerical value are all feasible。
Preferred version as the present invention, described method is: pending flue gas is introduced in plasma reactor, plasma reactor enters after plasma-treated removing dust granules thing and preliminary demercuration in the membrane bag filter being coated on plasma reactor outer wall and carries out membrane bag filter dedusting catalysis demercuration further, finally give the flue gas after purification。
In the present invention, pending flue gas is introduced into plasma reactor, under the effect of plus high-voltage field, gas molecule ionization in plasma reactor, produce substantial amounts of high energy electron, electronics again with other gas molecule collisions, gas ionization aggravation, then there is electron avalanche, produce substantial amounts of charged particle。Charged particle, under electric field action, collides with the dust in flue gas and makes it with charged。Plasma makes the electric charge of different (positive and negative) on the particulate matter band that passes through, thus from attracting mutually, and fine particulates also diffuses to bulky grain thing surface with the form of electrophoresis, is gathered into agglomerate and settles。By the coalescence effect of fine particulates in plasma, it is possible to the little fine particulates to submicron order is effectively collected。On dust band after electric charge, move to collecting plate under electric field action, discharge electric charge after arriving collecting plate and deposit, reach elimination purpose。In addition, owing to plasma producing substantial amounts of living radical, it is possible not only to series of chemical, it is possible to effectively removed by elemental mercury oxidation, and the oxygen-derived free radicals that plasma produces can also improve the activity of catalyst in follow-up membrane bag filter so that it is demercuration efficiency improves further。
The flue gas after plasma reactor processes gas outlet on plasma reactor enters membrane bag filter, the inside of membrane bag filter is polyimide fiber layer, it can further remove the particulate matter in flue gas, simultaneously, when flue gas is through membrane bag filter, be loaded with catalyst polytetrafluoroethylene floor can other Elemental Mercuries in oxidation removal flue gas effectively, reach the effect of elimination fine particulates and Elemental Mercury simultaneously。
Compared with prior art, the method have the advantages that
Plasma is combined by the present invention with membrane bag filter, the effect utilizing plasma makes the dust in flue gas produce charged and coalescence occurs, simultaneously the oxygen radical in plasma can oxidizing simple substance mercury, then gas is in membrane bag filter, micronic dust can be removed on the one hand, on the other hand the demercuration catalyst on filter bag can oxidation removal Elemental Mercury further, and the oxygen-derived free radicals that plasma produces can also improve catalyst activity, making the particulate matter removing efficiency in flue gas is more than 99%, the removal efficiency of Elemental Mercury is more than 95%, and make isoionic energy consumption reduce 20～50% relative to prior art。
Accompanying drawing explanation
Fig. 1 is the structural representation of flue gas ash removal mercury removal device of the present invention；
Fig. 2 is the profile of the Section A-A of flue gas ash removal mercury removal device of the present invention；
Fig. 3 is the structural representation of flue gas ash removal mercury removal device plasma reactor of the present invention；
Fig. 4 is membrane bag filter structural representation in flue gas ash removal mercury removal device of the present invention；
Wherein, 1-membrane bag filter, 2-electrode, 3-plasma reactor, 4-air inlet, 5-gas outlet, 6-earth lead, 7-power supply, 8-polyimide fiber layer, 9-polytetrafluoroethylene floor, 10-filter bag support。
Detailed description of the invention
Below in conjunction with several specific embodiments; exemplary illustration and help are further appreciated by the present invention; but embodiment detail is merely to illustrate the present invention; do not represent whole technical schemes under present inventive concept; therefore should not be construed as the technical scheme to the present invention is total to limit, some are In the view of technical staff, and the unsubstantiality not necessarily departing from inventive concept is changed; such as the technical characteristic to have same or similar technique effect simply changes or replaces, and all belongs to scope。
As depicted in figs. 1 and 2, the invention provides a kind of flue gas ash removal mercury removal device, described device includes plasma reactor 3 and membrane bag filter 1, and described membrane bag filter 1 is coaxial configuration with plasma reactor 3, and membrane bag filter 1 is coated on the outer wall of plasma reactor 3。
As it is shown on figure 3, described plasma reactor 3 is tubular structure, including electrode 2, air inlet 4 and gas outlet 5, electrode 2 is positioned at position, plasma reactor 3 axis, air inlet 4 and gas outlet 5 and is opened on the barrel of plasma reactor 3；The number of gas outlet 5 is more than 2。
The electrode 2 of described plasma reactor 3 is connected with power supply 7, and the outer wall of plasma reactor 3 is connected with earth lead 6；Described power supply 7 is high frequency electric source, in power of alterating and direct current, the pulse power or radio-frequency power supply any one。
Described membrane bag filter 1 is coated on the outer wall of plasma reactor 3 and is fixed on plasma reactor 3 by filter bag support 10；Membrane bag filter 1 is coated on outer wall and and the plasma reactor interval 5～50cm of plasma reactor 3。
As shown in Figure 4, membrane bag filter 1 includes the polytetrafluoroethylene floor 9 of polyimide fiber layer 8 and supported catalyst from inside to outside successively；The catalyst of described polytetrafluoroethylene floor 9 load is demercuration catalyst；Described demercuration catalyst is Mn-Ce/TiO2Catalyst。
Embodiment 1:
Present embodiments provide following a kind of flue gas ash removal mercury removal device:
Described device includes plasma reactor 3 and membrane bag filter 1, described membrane bag filter 1 is coaxial configuration with plasma reactor 3, membrane bag filter 1 is coated on the outer wall of plasma reactor 3 and is fixed on plasma reactor 3 by filter bag support 10, membrane bag filter 1 and plasma reactor interval 30～35cm。Plasma reactor 3 is tubular structure, and including high-field electrode 2, air inlet 4 and gas outlet 5, high-field electrode 2 is positioned at position, plasma reactor 3 axis, air inlet 4 and gas outlet 5 and is opened on the barrel of plasma reactor 3；The number of gas outlet (5) is more than 2。The electrode 2 of plasma reactor 3 is connected with power of alterating and direct current 7, and the outer wall of plasma reactor 3 is connected with earth lead 6。
Membrane bag filter 1 includes the polytetrafluoroethylene floor 9 of polyimide fiber layer 8 and supported catalyst from inside to outside successively；The catalyst of described polytetrafluoroethylene floor 9 load is demercuration catalyst Mn-Ce/TiO2。
Adopting said apparatus that simulated flue gas is processed, in described simulated flue gas, fine particulates content is 2g/m3Left and right, Elemental Mercury content is 20ug/m3Left and right, processing method is as follows:
Pending simulated flue gas enters plasma reactor 3 through air inlet 4, high-field electrode 2 in plasma reactor 3 forms, with plasma reactor 3, the high voltage electric field that voltage is 50KV, gas ionization is made to contain a large amount of charged particles, fine particulates in flue gas brings different electric charge through electric field by electric-field charge and diffusional charging, under electric field action, charged particle is constantly agglomerated into the soot dust granule of greater particle size, plasma produces some reactive oxygen free radical simultaneously, Elemental Mercury in oxidation flue gas, then flue gas enters membrane bag filter 1 through gas outlet 5, flue gas is when membrane bag filter 1, fine particulates in flue gas can be filtered by the polyimide fiber matrix material in polyimide fiber layer 8 in membrane bag filter 1, Elemental Mercury in flue gas passes through load Mn-Ce/TiO2The polytetrafluoroethylene floor 9 of catalyst aoxidizes demercuration further, and wherein, the temperature of membrane bag filter dedusting is 200 DEG C, and making fine particulates content in the flue gas after eventually passing through process is 5～8mg/m3, Elemental Mercury content is 0.4～0.5ug/m3, namely particulate matter removing efficiency is on 99%, and the removal efficiency of Elemental Mercury is more than 95%, and makes isoionic energy consumption reduce 20～30% relative to prior art。
Embodiment 2:
Except membrane bag filter 1 and plasma reactor interval 5～10cm in the present embodiment, the gas outlet number of plasma reactor 3 is 5, membrane bag filter 1 includes polytetrafluoroethylene floor 9 and the polyimide fiber layer 8 of supported catalyst from inside to outside successively, the voltage that high-field electrode 2 in plasma reactor 3 and plasma reactor 3 are formed is 10KV, the flue gas ash removal mercury removal device power supply 7 adopted is outside the pulse power, and the miscellaneous part of device is all in the same manner as in Example 1 with connected mode。
Adopting this flue gas ash removal mercury removal device that simulated flue gas is processed, except the temperature of membrane bag filter dedusting is except 150 DEG C, its processing method is in the same manner as in Example 1, and making fine particulates content in the flue gas after eventually passing through process is 8～15mg/m3, Elemental Mercury content is 0.4～0.5ug/m3, namely particulate matter removing efficiency is more than 99%, and the removal efficiency of Elemental Mercury is more than 95%, and makes isoionic energy consumption reduce 20～40% relative to prior art。
Embodiment 3:
Except membrane bag filter 1 and plasma reactor interval 40～50cm in the present embodiment, the gas outlet number of plasma reactor 3 is 10, the voltage that high-field electrode 2 in plasma reactor 3 and plasma reactor 3 are formed is 100KV, the flue gas ash removal mercury removal device power supply 7 adopted is outside radio-frequency power supply, and the miscellaneous part of device is all in the same manner as in Example 1 with connected mode。
Adopting this flue gas ash removal mercury removal device that simulated flue gas is processed, except the temperature of membrane bag filter dedusting is except 300 DEG C, its processing method is in the same manner as in Example 1, and making fine particulates content in the flue gas after eventually passing through process is 15～20mg/m3, Elemental Mercury content is 0.7～1ug/m3, namely particulate matter removing efficiency is more than 99%, and the removal efficiency of Elemental Mercury is more than 95%, and makes isoionic energy consumption reduce 20～40% relative to prior art。
Comparative example 1:
Simulated flue gas is processed by this comparative example only with plasma reactor 3, the content of simulated flue gas is in the same manner as in Example 1, the structure of plasma reactor 3 and processing procedure are all in the same manner as in Example 1, and eventually passing through fine particulates content in the flue gas after process is 300mg/m3Left and right, Elemental Mercury content is 8ug/m3Left and right, namely particulate matter removing efficiency is about 85%, and the removal efficiency of Elemental Mercury is about 60%。
Comparative example 2:
Simulated flue gas is processed by this comparative example only with membrane bag filter 1, the content of simulated flue gas is in the same manner as in Example 1, all in the same manner as in Example 1 Deng structure and the processing procedure of membrane bag filter 1, eventually passing through fine particulates content in the flue gas after process is 200mg/m3, Elemental Mercury content is 10ug/m3, namely particulate matter removing efficiency is 90%, and the removal efficiency of Elemental Mercury is 50%。
The result of integrated embodiment 1-3 and comparative example 1-2 can be seen that, plasma is combined by the present invention with membrane bag filter, the effect utilizing plasma makes the dust in flue gas produce charged and coalescence occurs, simultaneously the oxygen radical in plasma can oxidizing simple substance mercury, then gas is in membrane bag filter, micronic dust can be removed on the one hand, on the other hand the demercuration catalyst on filter bag can oxidation removal Elemental Mercury further, and the oxygen-derived free radicals that plasma produces can also improve catalyst activity, making the particulate matter removing efficiency in flue gas is more than 99%, the removal efficiency of Elemental Mercury is more than 95%, and make isoionic energy consumption reduce 20～50% relative to prior art。
Applicant states, the present invention illustrates the method detailed of the present invention by above-described embodiment, but the invention is not limited in above-mentioned method detailed, does not namely mean that the present invention has to rely on above-mentioned method detailed and could implement。The equivalence of each raw material of product of the present invention, it will be clearly understood that any improvement in the present invention, is replaced and the interpolation of auxiliary element, concrete way choice etc. by person of ordinary skill in the field, all falls within protection scope of the present invention and open scope。
Claims (10)
1. a flue gas ash removal mercury removal device, it is characterized in that, described device includes plasma reactor (3) and membrane bag filter (1), described membrane bag filter (1) and plasma reactor (3) are coaxial configuration, and membrane bag filter (1) is coated on the outer wall of plasma reactor (3)。
2. flue gas ash removal mercury removal device according to claim 1, it is characterized in that, described plasma reactor (3) is tubular structure, including electrode (2), air inlet (4) and gas outlet (5), electrode (2) is positioned at plasma reactor (3) position, axis, and air inlet (4) and gas outlet (5) are opened on the barrel of plasma reactor (3)；
Preferably, the number of gas outlet (5) is more than 2。
3. flue gas ash removal mercury removal device according to claim 2, it is characterized in that, the electrode (2) of described plasma reactor (3) is connected with power supply (7), and the outer wall of plasma reactor (3) is connected with earth lead (6)；
Preferably, described power supply (7) is high frequency electric source；
Preferably, described power supply (7) be power of alterating and direct current, in the pulse power or radio-frequency power supply any one。
4. the flue gas ash removal mercury removal device according to any one of claim 1-3, it is characterized in that, described membrane bag filter (1) is coated on the outer wall of plasma reactor (3) and is fixed on plasma reactor (3) by filter bag support (10)；
Preferably, membrane bag filter (1) is coated on the outer wall of plasma reactor (3) and is spaced apart 5～50cm with plasma reactor outer wall。
5. the flue gas ash removal mercury removal device according to any one of claim 1-4, it is characterised in that the combination of the polytetrafluoroethylene floor (9) that membrane bag filter (1) is polyimide fiber layer (8) and supported catalyst；
Preferably, the catalyst of described polytetrafluoroethylene floor (9) load is demercuration catalyst；
Preferably, described demercuration catalyst is Mn-Ce/TiO2Catalyst。
6. the plasma binding film catalysis method to flue gas ash removal demercuration, it is characterized in that, described method is: after pending flue gas first plasma-treated removing dust granules thing and preliminary demercuration, carries out membrane bag filter dedusting further catalysis demercuration, finally gives the flue gas after purification。
7. want the method described in 6 according to right, it is characterised in that the voltage of described Cement Composite Treated by Plasma is 0～100KV and does not include 0；
Preferably, described Cement Composite Treated by Plasma carries out in plasma reactor (3)。
8. want the method described in 6 or 7 according to right, it is characterised in that catalyst used in described membrane bag filter dedusting is demercuration catalyst；
Preferably, described demercuration catalyst is Mn-Ce/TiO2Catalyst；
Preferably, the temperature of described membrane bag filter dedusting is 150～300 DEG C。
9. want the method described in any one of 6-8 according to right, it is characterised in that in the flue gas after purification, particle content is 5～20mg/m3, mercury content is 0.4～1ug/m3
10. want the method described in any one of 6-9 according to right, it is characterized in that, described method is: pending flue gas is introduced in plasma reactor (3), entering after plasma-treated removing dust granules thing and preliminary demercuration in the membrane bag filter (1) being coated on plasma reactor (3) outer wall in plasma reactor (3) and carry out membrane bag filter dedusting catalysis demercuration further at 150～300 DEG C, after finally giving purification, particle content is 5～20mg/m3, mercury content is 0.4～1ug/m3Flue gas。
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